cissplain

Etymology
, after.

Verb

 * 1)  To explain transgender issues, people or behavior to a trans person (as a cis person) in a condescending manner, presuming the listener’s inferior understanding.
 * 2) * 2012, Natalie Reed, "How To Ask A Trans Person Questions Without Being Insensitive About It", quoted in Benjamin Zimmer, Jane Solomon, & Charles E. Carson, "Among the New Words", American Speech, Volume 89, Issue 4 (2014), page 480:
 * Don’t ask us about transgenderism only to cissplain how we’re still “really” our birth sex and always will be.